Power-hammer.



'L.' E. SUMMERS. j POWERIHAMMER. APPL ICATION FILED NOV. 27. l9 l4.

Patented Nov; 30, 19-15 troit, \Vayne county,

LEWIS E. SUMMERS, OF DETROIT COMPANY, OF CHICAGO,

MICHIGAN, ASSIGNOR ro CHICAGO PNEUMATIC 'rOoL ILLINOIS, A CORPORATION or NEW JERSEY.

POWER-HAMMER.

Specification of Letters Patent.

Patented Nov, 30, 1915.

Application filed November 27,1914. Serial No. 874,232.

To all whom it may concern:

Be it known that 1, Lewis E. SUMMERS, acitizen of the United States, residing at De- Michigan, have invent-' new and useful Improvementsin edcertain of which the following is Power-Hammers,

. aspecification.

Toe liable to cause illustrated by Fig.'l;'Fig. 3

set of. a riveting hammer, a

I definite description inotive fluid, or

' My invention pertains to so-called power hammers such as, but not necessarily, pneumatic hammers, and the object thereof is to provide such hammer with safety first features as respects the working tool. 'As is well known, the laws of many States'now compel the use of safety devices or means for preventing the shooting out of the working tool from the hammer which would v injury to the workmen or others in the vicinity. 7

My invention comprises a working tool get special format-ion adapted to cooperate with a power hammer of usual construction with the exception of a slight change to eonimodate it to said form of tool. tool is so constructed that in use itis locked to the-hammer, that is prevented from being shot out from the hamnierduring the operation and yet at the same time the construction and arrangement are such that it may be readily withdrawn from-the hammer when desiredfl 4 In the drawing Figure 1 isan elevation of a pneumatic hammer showing a portion thereof broken away to illustrate my invention; Fig. 2 a section at right anglesto that the broken away portionof a. section on the line 3-3 of Fig. 1; Figs. 4 and 5 sections on the same line but looking in the direction of the ar- -rows 4- and 5-5'respectively'; andFig. 6

a perspective of the working :tooh,

My invention is applicable to power hammers of different types and operated by any desired power and also applicable to'work ing tools of difierent types, such as a rivet chisel of a chippin hammer, a drill of a rock drill, and so on.. \Vhile for the purpose of aclear and of my invention, I have shown the same embodiedin a pneumatic "riveting hammer, yet it will be understood that my invention is not to belimited to .thattype or construction of hammer or to the employment of compressed air asthe the use of a rivet set. .In the present instance lhave shown'my invention .as applied to it will be stopped;

the well-known Boyer construction and type of riveting hammer, which comprises essentially a cylinder; or barrel 1, a piston 2 reciprocating therein, and a grasping handle 3 secured to the rearward end of the cylinder. The forward end of the cylinder receives a rivet set 4 which is of the peculiar formation as to the shank portion received within the bore of the cylinder. As'shown the shank has,

as toits intermediate portion, opposite flattened sides 4:, a circular groove 49 and an inner end having opposite flattened portions or sides 4. The flattened sides 4 are parallel to each other and likewise the two flattened sides l are parallel to each other. However, the two sets of flattened sides 4: and 4 are in planes at an angle to each other, 1n the present instance at right angles.

' The front end of the cylinder bore is of the usual construction with the exception that it is provided on opposite sides with the crescent-shapedlugs 1 which are adapted to cooperate with the shank of the working tool. 1n the present instance these, lugs correspond to such portions that would have to be applied to the makethe same circular. Consequently the provision of the flattened sides 4 of the shank permit the shank to be inserted in the bore of the cylinder, notwithstanding the presence of the lugs '1". The sharikas iiiserted until the lugs 1 are in 'register with the'groove 4? at whichtime such lugs will strike the left-hand shoulder of the groove. The shank is thereupon turned turn so as to bring the flattened sides i 'into register with the lugs 1 whereupon the shank' can be inserted the full distance.

As is well known the "working tools 0 power hammers generally. require a limited. lost motion, that is, a relative movement ice-- tween the toolitself and the end of the cylinder and in the-present instance this is provided by the length of the flattened sides 4* plus the width of the groove 4? It will be noted that the rivet set can move outwardly until the lugs' l strike the righthand' shoulder of the groove to withdraw the tool withoiit'giving it a.

quarter turn. In an actual operation the lost motion is not as great as that stated so that onlythe flattened sides 4 are presented to thelugs 1 and. consequently during operainnerend of the shank to P whereupon It, is therefore impossible a quarter ion 'a bore tion it is impossible for the working tool to be turned at ll, owing to the interference presented by the lugs .1. Even during the operation of the hammer when the tool is not presented to the work; the tool cannot outward position and be prevented fronr turning with relation to the hannner cylinder, with the result that when the hammer is carried in this position and given a twist, there is no possibility of the tool dropping out. 5

While I have shown segmental logs 1 integral with the inner wall of the-hannner eyiinder and prefer to so make them in new hammers, yet it will he unders ood that they may he made se mrate therefrom and attaehed thereto or otherwise "formed.

By the use of my. invention I provide a very simple, compact and self-contained arrangement for working tools of power ham-,

more.

I claim:

1 A working tool for power hannners characterized by a shank having its intermediate portion provided with opposite fiat sides and its and portion likewise provided with opposite fiat sides in a plane at an angle to the first'nained flat sides, and also having a oircannferential groove between said two sets of fiat sides, in combination with the cylinder of a power hannner havprovided in its tool-receiving-end with lugs adapted to coi-iperate with said flattened sides and groove of the shank.

2'. A working tool for power hammers characterized by a shank provided with two opposite fiat sides 4*, a eircmn'ferential groove and rear" permitting rotation of the shank groove i. two opposite fiat are in, planes at right angles to the i of the sides s. and two opposi e reci in line with said sides 12, in eomtnnation with the cylinder of a power hammer haw ing a bore provided near one end with opposite lugs with whirh said fiat sides and as cooraerate.

2-3. In COHlliill'LiQii with the eviinder of a power hamm r having}: here in its toolreceiving end provided with a iog a work ing tool equipped with a shank having its intermediate portion formed complementary i-rhieh ants to said here and lug: and permittingiongitndinal movement oi the tool the end pos tion of the shank being likewise formedcomplementar to said horeand log and oil'- set angnlariy with respert to said first mentioned. portion and the two complementary portions heint separated hv a circumferential groove permitting rotation of the shank within the end of the tool when the iug is in registration with the groove.

i. In combination with the cylinder of a power hammer having a bore in its toolreeeiving end provided with a log. a work ing tooi equipped with a shank. having its int mediate portion tor-med com denientary to said here and tag and permitting longitudinal movement of the tooi. the en l-portion of the shank being likewise formed with a sol-fare comMomentary to said bore and lag Mending tfiiillk end of the shank and offset at subs mtiaily right angies'with respect to said first mentioned portion, said end 1):. "tion being aiso formed with a second surface eompiemrntar to said here and log and in line with the.colnplemrntnly suri'aee of said interior-ti i't "on and not extending to the mid oi the shank; am: the intermediate and end portions of the shank being separated in a rsreomterential groove end ofthe tool when the log is in registration with the groove.

within the 

